Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Mar. 31, 2026 |
|---|---|---|
| Inventory [Line Items] | ||
| Inventories | $ 379,573 | $ 408,391 |
| Raw Materials and Material-in-Progress [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 134,457 | 158,829 |
| Finished Cement [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 62,505 | 63,293 |
| Aggregates [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 15,766 | 16,073 |
| Gypsum Wallboard [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 6,685 | 4,809 |
| Recycled Paperboard [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 8,555 | 10,675 |
| Repair Parts and Supplies [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 133,038 | 135,110 |
| Fuel and Coal [Member] | ||
| Inventory [Line Items] | ||
| Inventories | $ 18,567 | $ 19,602 |